SGrade/USMLE Step 1/Physiology — Core Concepts
Physiology — Core Concepts Practice Questions
This topic covers essential Physiology principles as tested in USMLE Step 1.
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Sample questions
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A 45-year-old man with type 2 diabetes experiences a severe hypoglycemic episode. His body's immediate counter-regulatory response aims to restore blood glucose levels. Which of the following cellular events is primarily responsible for the rapid release of stored glucose from the liver in this situation?
Examiner's Design Intent
Tests integration of clinical endocrinology with molecular biochemistry - can student connect hypoglycemic crisis to specific enzymatic mechanism for glucose mobilization
A 65-year-old man with a history of hypertension is prescribed a new medication. After a few days, he experiences lightheadedness upon standing, but his resting blood pressure is well controlled. This medication primarily causes peripheral vasodilation by directly activating potassium channels in vascular smooth muscle cells. Which of the following best describes the immediate cellular effect of this drug's action on these cells?
Examiner's Design Intent
Tests integration of cellular physiology and pharmacology by requiring students to identify the immediate electrical consequence of ion channel drug action
A 28-year-old woman is admitted to the emergency department after a motor vehicle accident. She is unconscious and has significant blood loss. Her blood pressure is 70/40 mmHg, and her heart rate is 130 bpm. Which of the following is the primary physiological response initiated by her body to maintain cerebral perfusion in this acute hypovolemic state?
Examiner's Design Intent
Tests fundamental understanding of immediate physiological sensing and response mechanisms in shock, specifically the baroreceptor reflex as the primary initiator of cardiovascular compensation
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